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R4™ Multipurpose Screw – All-purpose interior and exterior screw
GRK’s R4™ screws have some of the most advanced technology around for faster screw driving with a whole lot less effort and no pilot holes required. Pilot holes are only needed if the building-material manufacturer requires it. Always check with the manufacturer’s literature for installation recommendations. The patented nib design under the head acts like a saw blade with six self-contained cutting pockets. So, you can countersink these screws into even the hardest of exotic woods. The threads are extremely aggressive, so they can even be used on fibrous material like OSB. The screws 2" and longer also have a “CEE” four-threaded portion that enlarges the hole, reducing friction and increasing the “drawing strength” for the nonthreaded portion, making the longer screws much easier to drive. These screws can be used in all woods and plastic applications without shredding or cracking the surface. The 90º angle under the screw head fits perfectly into pre-countersunk holes for hardware brackets, making these great for hinges and locks. They can also be used for decking, stairs and general residential construction. Equipped with star drive recess. Stated lengths are “soft conversions” from metric lengths. Some sizes available in 305 stainless steel. All of the GRK stainless steel products come with a limited lifetime warranty against staining and rusting. Imported